Do the hairs lost from androgenic alopecia have white bulbs at the end?

The white bulbs at the end of a hair is likely sebum a waxy substance made from your oil glad.  It is not related to genetic hair loss or balding.

This is a great question. Yes, the early stages of genetic hair loss give hair loss with white bulbs because these are indeed telogen hairs that are shed. Although many people think of the causes of telogen effluvium as low iron, thyroid problem, crash diets or stress... androgenetic alopecia also given a telogen effluvium and loss of hairs with white bulbs. These hairs are often thinner than other hairs but in the very early stages of hair loss they may be fairly large. Be sure to see a physician to confirm the reason for your loss of 500 hairs.  This is rather unusual for genetic hair loss.  Without seeing your scalp up close and knowing more about your hair loss, it is not possible for anyone to provide a diagnosis. 

AGA  is usually more-aggressive in early twenties ( 20 to 24 ) ...you should look in to the family history of baldness on your father side or mother side .....if it's in your family then it can be first indication towards andro genetic Alopecia  ( AGA) . Otherwise you should consult your dermatologist or family physician .... You didn't discussed here if there was any history of surgery of serious illness in past 90/120 days ... Then we can think of anything like Telogen effluvium or dietary deficiency ...